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About Micro-Ohmmeters


Contact resistance measurement is one of the most important and common tests during switchgear manufacturing, commissioning and maintenance stages. Besides switchgear testing, the RMO digital micro-ohmmeters are designed for simple, safe and efficient testing of:

  • disconnecting switches,
  • high-current bus bar joints,
  • cable splices,
  • welding joints,
  • and different high-current links in factory and high-induction field environments.

All DV Power RMO micro-ohmmeters use Kelvin’s 4-point measurement principle which is the most convenient for very small resistance measurements. The measurements are accurate and in accordance with international standards for AC high-voltage circuit breakers testing (IEEE C37.09 and IEC 62271-100).

Starting from 2003, DV Power has been a trendsetter on the market when our first 500 A micro-ohmmeter weighing only 8 kg (RMO500A / CPM500) was released.

Currently, DV Power micro ohmmeters portfolio includes 19 models, divided into 4 series:

  • 13 portable models: RMO-A (6), RMO-G (7) series, and RMO-C (3) series.
  • 6 handheld models: RMO-H (6) series

The instruments generate a user-selectable and ripple-free test current up to 800 A in an automatically regulated test ramp. Test current ramping significantly decreases the influence of the magnetic transients to measurement.

Series Comparison

Current Range
Resistance Range
Both Sides Grounded
Dead-Tank Circuit Breaker Testing
High-Precision Module
Continuous Current Micro-Ohmmeter RMO-C Isometric View
RMO200C, RMO300C, RMO500C
up to 500 A DC
0,1 µΩ – 999,9 mΩ (expandable to 6000 mΩ)
Safety Micro-ohmmeter RMO-G with Both Sides Grounded Feature
RMO100G, RMO200G, RMO300G, RMO400G, RMO500G, RMO600G, RMO800G
up to 800 A DC
0,1 µΩ – 999,9 mΩ
Protective Bonding Tester Micro-Ohmmeter RMO-E Isometric View
RMO100A, RMO200A, RMO300A, RMO400A, RMO500A, RMO600A
Up to 600 A DC
0,1 µΩ – 999,9 mΩ
Handheld Micro-Ohmmeter Front View RMO-H
RMO-H1, RMO-H21, RMO-H2, RMO-H22, RMO-H3, RMO-H32
Up to 300 A DC
0,1 µΩ – 3000 mΩ